Experimental investigation of a biomass-derived nanofluid with enhanced thermal conductivity as a green, sustainable heat-transfer medium and qualitative comparison via mathematical modelling
In this study, bio-based carbon nanospheres (CNSs) were synthesized from lignocellulosic-rich groundnut skin (Arachis hypogaea) and tested for their practical application in nanofluids (NFs) for enhanced heat transfer. The CNSs were characterized using various techniques, including FESEM, EDS, XRD, Raman spectroscopy, zeta potential analysis, and FTIR. Thermal conductivity (TC) and viscosity measurements were conducted using transient plane source (TPS) technique with a Hot Disk thermal analyser and discovery hybrid rheometer, respectively. The nanoparticles (NPs) were dispersed in two base fluids: ethylene glycol (EG) and a 60 : 40 mixture of deionized water (DI) and EG. Optimization studies were performed by varying the stirring and measurement times to improve TC values. The results showed that when a power source of 40 mW was applied at a high concentration of nanoparticles (i.e., 0.1 wt%), there was a 91.9% increment in thermal conductivity (TC) compared to the base fluid EG. DI-EG-based nanofluids (NFs) exhibited enhancements of up to 45% compared to the base fluid DI-EG (60 : 40), with a heating power of 80 mW and concentration of 0.1 wt%. These results demonstrated significant TC improvements with NP incorporation. Further experiments were performed by varying the temperature in the range of 30-80 C with readings taken for every 10 C increase, which showed a direct relation with the TC values. At 80 C, EG-based NFs showed increments of 77%, 111.49%, 139.67% and 175% at 0.01, 0.02, 0.05 and 0.1 wt% concentrations of NPs, respectively. It was also found that with the increase in the concentration of NPs, viscosity increased, whereas an increase in the temperature led to a decrease in viscosity. The CNS nanofluid exhibited a Newtonian behaviour with the nanoparticle concentration and temperature, resulting in an approximately 114% enhancement compared to the base fluid when the concentration of CNSs was 0.1 wt% at 30 C but decreased by up to 18% when the temperature was increased to 90 C. Using appropriate mathematical models for assessing thermophysical quantities, it was discovered that the model values and experimental values correspond reasonably well. Our method thus validates our experimental results and deepens the understanding of the mechanisms behind enhancing thermal conductivity in biomass-derived nanofluids. In summary, our work advances sustainable nanomaterial synthesis, providing a new solution for boosting thermal conductivity while maintaining environmental integrity, thereby inspiring further research and innovation in this field. 2024 RSC.
Bijapur K.; Mandal S.; Siddheshwar P.G.; Bose S.; Hegde G.
Nanoscale Advances, Vol-6, No. 19, pp. 4944-4955.
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.1039/d4na00362d https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201079006&doi=10.1039%2fd4na00362d&partnerID=40&md5=9e5622d93d0f1f82663060bc3da5970b
Bijapur K., Department of Chemistry, Christ University, Hosur Road, Bengaluru, 560029, India, Centre for Advanced Research and Development (CARD), Christ University, Hosur Road, Bengaluru, 560029, India; Mandal S., Department of Materials Engineering, Indian Institute of Science, Bengaluru, 560012, India; Siddheshwar P.G., Centre for Mathematical Needs, Department of Mathematics, Christ University, Hosur Road, Bengaluru, 560029, India; Bose S., Department of Materials Engineering, Indian Institute of Science, Bengaluru, 560012, India; Hegde G., Department of Chemistry, Christ University, Hosur Road, Bengaluru, 560029, India, Centre for Advanced Research and Development (CARD), Christ University, Hosur Road, Bengaluru, 560029, India
Experimental Investigation of Air Circulation Using Duct System in a Non-AC Bus Coach
Air Circulation; Non-AC Bus; Passenger Comfort; Pollution
Public transport is the life line in many of the developing and under developed countries for the safe conveyance, i.e. also consider as economical. The major limitation in public transport (non-AC busses) Air Condition, is the lack of proper air circulation leading to suffocation and vomiting. The present research work emphasis on design and analysis of air flow duct system (non AC Busses) to increase the level of comfortance of the passengers, tools like solidworks software 2016 is used for 3D drawing, Hypermesh software 13.0 is for the discretization and ANSYS Fluent software 16.0 for the Computational Fluid Dynamic (CFD) analysis, from the experimental the airflow is found to be 10 m/s, and from the numerical analysis the airflow is found to be 9.8 m/s, by comparing the experimental and numerical results a negligible deviation of 2% is observed and it is within the limit. Published under licence by IOP Publishing Ltd.
Niranjana S.J.; Kubsad S.S.; Nagaraj Y.; Manjunath S.; Shivakumar S.
IOP Conference Series: Materials Science and Engineering, Vol-1065, No. 1
Niranjana S.J., Department of Mechanical Engineering, School of Engineering and Technology, CHRIST (Deemed to Be University), Bengaluru, Karnataka, 560076, India; Kubsad S.S., Department of Mechanical Engineering, Atria Institute of Technology, Bengaluru, Karnataka, 560024, India; Nagaraj Y., Department of Mechanical Engineering, SJM Institute Technology, Chitradurga, Karnataka, 577502, India; Manjunath S., Department of Mechanical Engineering, School of Engineering and Technology, CHRIST (Deemed to Be University), Bengaluru, Karnataka, 560076, India; Shivakumar S., Department of Mechanical Engineering, School of Engineering and Technology, CHRIST (Deemed to Be University), Bengaluru, Karnataka, 560076, India
Experimental investigation of boundary shear stress in meandering channels
Laboratory experimentation for bed shear stress distribution has been carried out in two sets of meandering channels. The channels have cross-over angles of 110 and 60 constructed by 'sine-generated' curves over a flume of 4?m width. Variations in bed roughness were studied for the meandering main channel. Bed shear stress distribution across a meandering length for the 110 and 60 channels was examined for different sinuosities and roughnesses. The boundary shear stress study illustrated the position of maximum shear along the apex section and across the meandering path. These variations were observed for different flow depths. A comparison of the bed shear among the three experimental channels was conducted, and the results were analyzed. 2023 Author(s).
Sudhir M.R.; Pradhan A.; Sahoo K.; Beulah M.; Mohanta A.; Sethy K.
AIP Conference Proceedings, Vol-2763, No. 1
https://doi.org/10.1063/5.0158579 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176722706&doi=10.1063%2f5.0158579&partnerID=40&md5=ab8480ec0dfb637322d407ec1ea83a3b
Sudhir M.R., Department of Civil Engineering, CHRIST, Deemed to Be University, Karnataka, Bangalore, 560074, India; Pradhan A., Department of Civil Engineering, CHRIST, Deemed to Be University, Karnataka, Bangalore, 560074, India; Sahoo K., School of Civil Engineering, KIIT Deemed to Be University, Odisha, Bhubaneswar, 751024, India; Beulah M., Department of Civil Engineering, CHRIST, Deemed to Be University, Karnataka, Bangalore, 560074, India; Mohanta A., Department of Mechanical Engineering, Vellore Institute of Technology, Tamil Nadu, Vellore, 632014, India; Sethy K., Government College of Engineering Kalahandi, Bhawanipatna, India
Experimental investigation of Glass Laminate Aluminium Reinforced Epoxy characteristics influences through low velocity impact test
drop weight test; GLARE; low-velocity impact; SEM
The fibre being one of the recently implemented advanced materials in distinctive applications is being reinforced with metals to constitute a unique composite laminate. This reinforcement will enhance the sustenance property of the laminate used in automotive sectors. In most automotive sectors, drop weight analysis at varying velocity ranges is performed to evaluate the damage characteristics of the vehicle body. Hence, the present work leads us through the study on influence of low-velocity impact at varying heights over the Glass Laminate Aluminium-Reinforced Epoxy (GLARE) laminate characteristics. Here, the laminate of constant thickness was subjected to drop weight impact. Three distinct thicknesses of (0.2, 0.3 and 0.4 mm) Al-2024 T3 aluminium alloy were used. The results indicate that laminate can sustain up to critical load in terms of impact velocity as 3.13 m/s, and beyond which, it leads to delamination damage at 3.49 m/s. The above results indicate that the maximum absorbed energy by the laminate before catastrophic failure (crack) was noticed to be 14.43 J in the case of sample B. Further, it is noticed that GLARE laminate with 0.3 mm face sheet thickness has best results with reference to both absorbed energy and damage when compared with other thicknesses. 2022 Informa UK Limited, trading as Taylor & Francis Group.
Advances in Materials and Processing Technologies, Vol-9, No. 2, pp. 689-701.
Kumar M H., Department of Automobile Engineering, CHRIST (Deemed to Be University), Bengaluru, India; Mathivanan N.R., Department of Mechanical Engineering, PES University, Bangalore, India
Experimental Investigation of Nano Hexagonal Boron Nitride Reinforcement in Aluminum Alloys Through Casting Method
AA 7050; Aluminum metal matrix composites; Nano hexagonal boron nitride; Nanocomposites; Sir casting
Aluminum metal matrix composites (AlMMCs) have a significant impact on a variety of industries that seek for innovation, efficiency, and sustainability. AlMMCs are substantial because of the special combination of properties that make them an essential part of contemporary production and design. Custom made properties of the AlMMCs can be obtained by the reinforcing different ceramic particles. Among the reinforcements, nano hexagonal boron nitride were rarely used. Hexagonal boron nitride particles have self-lubrication properties and it is one of the promising substitutes of graphite. The incorporation of hexagonal boron nitride (hBN) as a reinforcement material in aluminum alloys has garnered significant attention in recent years. This paper provides an overview of the reinforcement of nano hBN in aluminum alloys through casting method and highlights the mechanical and thermal properties of these alloys. The results show that the wear rate of the composite at 2wt.% is 9.91% lower for a load of 40 N when compared to unreinforced composite. Furthermore, the impact of hBN content, dispersion, and processing parameters on the properties of the composites is analyzed. The unique structural and thermal properties of hBN, along with excellent lubricating abilities, make it a promising candidate for reinforcing aluminum composites. The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
Springer Proceedings in Physics, Vol-415 SPP, pp. 311-318.
Springer Science and Business Media Deutschland GmbH
Menachery N., Department of Mechanical Engineering, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore, India, Department of Mechanical Engineering, Jyothi Engineering College, Kerala, Thrissur, India; Thomas S., Department of Mechanical Engineering, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore, India; Deepanraj B., Department of Mechanical Engineering, College of Engineering, Prince Mo-hammad Bin Fahd University, Al Khobar, Saudi Arabia
Experimental investigation of plain and nano-graphene oxide mixed dielectric for sustainable EDM of Nimonic alloy using Cu and Brass electrode: A comparative study
Electro discharge machining; Material removal rate; Nano graphene oxide mixed dielectric; Surface roughness; Tool wear rate
The current research investigates the machinability of a novel Nimonic alloy through electro-discharge machining by assessing Material Removal Rate, Tool Wear Rate and Surface Roughness. The machining was conducted using plain dielectric and Graphene Oxide (GO) nanoparticles (5 g/l) mixed dielectric considering both Copper and Brass electrode. The novelity lies when machining with nano GO mixed dielectric. It was observed that the use of Copper electrode in machining of the alloy in nano GO mixed dielectric results in superior quality machining, demonstrating enhanced performance. The key findings include the identification of optimal parameters, where Vg of 70 V, Ton of 200 s, Fp of 0.5 kgf/mm2 maximize MRR (16.231 mm3/min) and minimize TWR (0.0062 mm3/min) and SR (5.1423 m). The microstructural study of the machined surface and sustainability study along with the detailed comparative analysis of responses assures the superiority of machining in Nano GO mixed dielectric-Cu electrode environment. 2024 Elsevier Ltd
Behera, Asit; Kumar Sahoo, Ashok; Sankar Mahapatra, Siba
Measurement: Journal of the International Measurement Confederation;Volume;241;Issue;;Article No.;115659;
All Open Access; Hybrid Gold Open Access
https://doi.org/10.1016/j.measurement.2024.115659 https://www.scopus.com/pages/publications/85203446947?origin=resultslist
Behera A., School of Mechanical Engineering, Kalinga Institute of Industrial Technology (KIIT), Deemed to be University, Bhubaneswar-24, Odisha, India; Kumar Sahoo A., School of Mechanical Engineering, Kalinga Institute of Industrial Technology (KIIT), Deemed to be University, Bhubaneswar-24, Odisha, India; Sankar Mahapatra S., Department of Mechanical Engineering, National Institute of Technology, Odisha, Rourkela, India
Experimental Investigation of Salt Hydrate Phase-Change Material (Shape-Stabilized) Applied to a Solar Collector
Direct absorption; Salt hydrate; Shape-stabilized phase-change material; Solar power; Thermal conversion
A complex element of water heater by solar power involves the requirements of storage tank, which not only occupies considerable space but also adds com-plexity to the plumbing and installation procedures; this research marks the initial endeavor to practically utilize shape-stabilized (SS) phase-change material (PCM) within a tank-less, evacuated tube with direct absorption (ET-Direct Absorption) solar collector. The primary objective was to tackle challenge of storage of the solar power. A PCM (salt hydrate) was proposed, with different component concentrations explored to determine the most effective mixture. Once the optimal compound was identified, it underwent rigorous testing over numerous cycles to ensure its sustainable its storing capabilities. Additionally, the planetary system was charged in dormancy mode (without flow of water) and subsequently discharged at the rate of flows of 15, 25, and 35 liters per hour (LPH). Results indicated a note-worthy improvement in efficiency of the heat system in the stasis mode, which increases from 62 to 80% with the utilization of this heat storing cum collecting unit. Moreover, it was observed that transitioning from a rate of flow of 1525 LPH had minimal impact on the collec-tors heat gain, but using a rate of flow of 35 LPH sig-nificantly reduced efficiency of discharge. The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
Kannakumar K.; Manikandan P.; Girimurugan R.; Sahoo D.K.; Krishna Kishore S.V.; Rasagopal P.
Advances in Science, Technology and Innovation, Vol-2024, pp. 189-195.
Kannakumar K., Department of Mechanical Engineering, Shree Venkateshwara Hi-Tech Engineering College, Tamil Nadu, Gobichettipalayam, 638 455, India; Manikandan P., Department of Electrical and Electronics Engineering, KSR Institute for Engineering and Technology, Tamil Nadu, Tiruchengode, 637 215, India; Girimurugan R., Department of Mechanical Engineering, Nandha College of Technology, Tamil Nadu, Perundurai, 638 052, India; Sahoo D.K., School of Mechanical Engineering, Sathyabama Institute of Science and Technology, Tamil Nadu, Chennai, 600 119, India; Krishna Kishore S.V., Department of Marketing, School of Business and Management, Christ (Deemed to be University), Bangalore Kengeri Campus, Karnataka, Bengaluru, 560 074, India; Rasagopal P., Department of Mechanical Engineering, KSR College of Engineering, Tamil Nadu, Tiruchengode, 637 215, India
Experimental investigation of tribocorrosion
Abrasion; Adhesion; Corrosion; Electrochemistry; Erosion; Impact; In situ; Mechanisms; Temperature; Tribocorrosion
This chapter discusses various techniques available for evaluation of tribocorrosion behavior of industrial components, their applications, and limitations. Numerous influential factors of tribocorrosion, their mechanisms, and their characteristics have been discussed at length. Further, a case study of tribocorrosion behavior of aluminum-based in situ metal matrix composites have been deliberated comprehensively. 2021 Elsevier Inc. All rights reserved.
Keshavamurthy R.; Ramesh C.S.; Pradeep Kumar G.S.; Tambrallimath V.
Tribocorrosion: Fundamentals, Methods, and Materials, pp. 17-42.
Keshavamurthy R., Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bangalore, India; Ramesh C.S., Department of Mechanical Engineering, Presidency University, Bangalore, India, Presidency University, Bangalore, India; Pradeep Kumar G.S., Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bangalore, India, Department of Mechanical Engineering, Christ University, Bangalore, India, Department of Automobile Engineering, Christ University, Bangalore, India; Tambrallimath V., Department of Automobile Engineering, Dayananda Sagar College of Engineering, Bangalore, India
Experimental investigation of turbulent flow behavior in an air to air double pipe heat exchanger using novel para winglet tape
Friction factor; Nusselt number; Para-winglet tape inserts; Performance optimization index; Thermal and flow behavior
Double pipe Heat exchangers are some of the important equipment which is seen in a variety of industrial applications. In the current study a new type of insert, namely Para-Winglet Tape inserts are investigated for thermal and flow behavior from Reynolds number 6000 to 30000. The Para-Winglet Tape inserts are investigated for three sets of pitches and para-inclinations. The inclusion of para-winglet tape on the tube has intensified the turbulent kinetic energy and has resulted in recirculation in-between the inserts. The arrangement of the para-winglet tape has proved their worthiness over the plain tube. The highest Nusselt number was obtained for Case9 at Reynolds number 30000 with an enhancement of 407% and the least was obtained by Case7 at Reynolds number 6000 with an enhancement of 88% compared to plain double pipe heat exchanger. The highest friction factor was obtained for Case3 at Reynolds number 30000 with an enhancement of 846% and the least was obtained by Case7 at Reynolds number 24000 with an enhancement of 286% compared to plain double pipe heat exchanger. The maximum and minium performance optimization index value of 2.69 and 1.09 was achieved for Case9 and Case1 at Reynolds number 30000 and 6000. 2020 The Author(s).
Thejaraju R.; Girisha K.B.; Manjunath S.H.; Dayananda B.S.
Case Studies in Thermal Engineering, Vol-22
https://doi.org/10.1016/j.csite.2020.100791 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097611068&doi=10.1016%2fj.csite.2020.100791&partnerID=40&md5=246c0562dd2cd68426a0413d15ef0c9e
Thejaraju R., Department of Mechanical and Automobile Engineering, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore, India; Girisha K.B., Department of Mechanical Engineering, BGSIT-Adichunchanagiri University, BG Nagara, 571448, India; Manjunath S.H., Department of Mechanical Engineering, BGSIT-Adichunchanagiri University, BG Nagara, 571448, India; Dayananda B.S., Department of Mechanical and Manufacturing Engineering, MS Ramaiah University of Applied Sciences, Bangalore Karnataka, 560054, India
Experimental Investigation of Uniaxial Compressive Behavior of Composite Columns without and with Full and Partial CFRP Wraps
Experimentation; Modeling; Partial and full carbon confinement; Square columns
Concrete columns are the backbone of any major structure, and their strengthening, repair, and retrofit have always drawn special research attention. One of the techniques for strengthening and improving the ductility of concrete columns has been the application of carbon fiber-reinforced polymer (CFRP) materials. A total of 43 columns of different configurations were experimentally investigated to evaluate the uniaxial compressive behavior of composite columns. Experimental and international code-recommended load-carrying capacities, stress-strain relations, axial stiffness, ductility factor, and failure modes were examined in the study. When fully wrapped, the strength of both plain cement concrete and reinforced cement concrete columns improved by 21% each with reference to the unwrapped columns. In addition to providing the advantages of external confinement to the columns, full wrapping contributed to a strength increment of 21%, which compared well with the steel reinforcement contribution to a strength increment of 28% to 39%. The partial wrapping technique was found to be an economical alternative to the full wrapping technique, with strength enhancements of 6% to 12% in the case of both plain cement concrete and reinforced cement concrete partially wrapped columns. Two regression models for the load-carrying capacity for columns with and without wraps were developed with four key performance parameters: percentage steel reinforcement, percentage concrete, percentage carbon fiber-reinforced polymer wrap, and the weight of the specimen. The formulated models were validated and found to be robust and consistent with the results. 2024 American Society of Civil Engineers.
Practice Periodical on Structural Design and Construction, Vol-29, No. 3
American Society of Civil Engineers (ASCE)
https://doi.org/10.1061/PPSCFX.SCENG-1399 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189303876&doi=10.1061%2fPPSCFX.SCENG-1399&partnerID=40&md5=ab2ffac434ee0fa81b8851e5478c5b4b
Sudhir M.R., Dept. of Civil Engineering, Soet, Christ (Deemed to Be University), Karnataka, Bangalore, 560074, India; Beulah M., Dept. of Civil Engineering, Soet, Christ (Deemed to Be University), Karnataka, Bangalore, 560074, India
Experimental Investigation on Density and Volume Fraction of Void, and Mechanical Characteristics of Areca Nut Leaf Sheath Fiber-Reinforced Polymer Composites
Natural fiber-reinforced polymer composite is a rapidly growing topic of research due to the simplicity of obtaining composites that is biodegradable and environmentally friendly. The resulting composites have mechanical properties comparable to synthetic fiber-reinforced composites. In this regard, the present work is formulated with the objectives related to the development, characterization, and optimization of the wt% of reinforcements and the process parameters. The novelty of this work is related to the identification and standardization of the appropriate wt% of reinforcements and parameters for the processing of the areca nut leaf sheath fiber-based polymer composites for enhanced performance attributes. With this basic purview and scope, the composites are synthesized using the hand layup process, and the composite samples of various fiber compositions (20%, 30%, 40%, and 50%) are fabricated. The mechanical characteristics of biodegradable polymer composites reinforced with areca nut leaf sheath fibers are investigated in the present work, with a focus on the effect of fiber composition (tensile properties, flexural strength, and impact strength). The properties of composites are enhanced by combining the areca nut leaf sheath fiber and epoxy resin, with a fiber content of 50% being the optimal wt%. The Scanning electron microscopy (SEM) investigations also ascertain this by depicting the good interfacial adhesion between the areca nut leaf sheath fiber and the epoxy resin. The tensile strength of the composite specimen reinforced with 50% areca nut fiber increases to 44.6 MPa, while the young's modulus increases to 1900 MPa, flexural strength increases to 64.8 MPa, the flexural modulus increases to 37.9 GPa, and impact strength increases to 34.1 k J/m2. As a result, the combination of areca nut leaf sheath fiber reinforced epoxy resin shows considerable potential as a renewable and biodegradable polymer composite. Furthermore, areca nut leaf sheath fiber-reinforced epoxy resin composites are likely to replace petroleum-based polymers in the future. The ecosustainability and biodegradability of the composite specimen alongside the improved mechanical characteristics serve as the major highlight of the present work, and can help the polymer composite industry to further augment the synthetic matrix and fiber-based composites with the natural fiber-reinforced composites. 2022 B. A. Praveena et al.
Praveena B.A.; Santhosh N.; Buradi A.; Srikanth H.V.; Shankar G.; Ramesha K.; Manjunath N.; Karthik S.N.; Rudra Naik M.; Praveen Kumar S.
International Journal of Polymer Science, Vol-2022
https://doi.org/10.1155/2022/6445022 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85143435107&doi=10.1155%2f2022%2f6445022&partnerID=40&md5=43b801fb60be8d7c6e339e52f79bfb9e
Praveena B.A., Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Karnataka, Bengaluru, 560064, India; Santhosh N., Department of Mechanical Engineering, MVJ College of Engineering, Karnataka, Bengaluru, 560067, India; Buradi A., Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Karnataka, Bengaluru, 560064, India; Srikanth H.V., Department of Aeronautical Engineering, Nitte Meenakshi Institute of Technology, Karnataka, Bengaluru, 560064, India; Shankar G., Department of Mechanical Engineering, MVJ College of Engineering, Karnataka, Bengaluru, 560067, India; Ramesha K., Department of Mechanical and Automobile Engineering, School of Engineering and Technology, CHRIST (Deemed to Be University), Karnataka, Bangalore, 560074, India; Manjunath N., Department of Sciences and Humanities, School of Engineering and Technology, CHRIST (Deemed to Be University), Karnataka, Bangalore, 560074, India; Karthik S.N., Department of Mechanical Engineering, New Horizon College of Engineering, Karnataka, Bangalore, 560103, India; Rudra Naik M., Department of Electro Mechanical Engineering, Arba Minch University, Sawla Campus, Ethiopia; Praveen Kumar S., Faculty of Mechanical Engineering, Arba Minch Institute of Technology, Arba Minch University, Ethiopia
Experimental investigation on the effect of varying percentage of E-waste particulate filler in GFRP composite laminates
E-waste particulate fillers; Flexural strength; GFRP composite laminates; Mechanical characterization; Shore D tests
The advent of newer technology increases the electrical and electronic devices into the market in a rapid phase, thereby causing the previous generation gadgets to become obsolete, in spite of the gadgets being in good working condition. This is one of the main causes for the increase of E-waste. In the past two years itself the e-waste has gone up by 8% with respect to weight globally. An attempt is made to utilize the e-waste in a productive manner as a filler material and study its characteristics when subjected to different mechanical tests. This paper describes the fabrication and mechanical characteristics of new polymer composites consisting of E-glass fiber reinforcement along with filler material. Study of composites play a very important role in material science, metallurgy, chemistry, solid mechanics and engineering applications. The specimens were fabricated with the help of hand layup technique followed by vacuum bagging process. Mechanical tests viz., tensile test, Flexural test, and Shore D test has been performed. Samples were made of three different compositions of E-waste filler particulate, 5%, 10% and 15%. These tests have been conducted to find out the impact of varying percentage of filler material on the composite laminates. With the increase in the percentage of e-waste filler, there is a reduction in the tensile strength of the laminate, while the flexural strength of the laminates increased with increase in the filler material. The laminate with 5% filler material exhibited higher hardness than the other two samples. 2019 Elsevier Ltd.
Mathivanan N.R.; Aiyappa A.C.; Kumar M.H.
Materials Today: Proceedings, Vol-28, pp. 1130-1134.
https://doi.org/10.1016/j.matpr.2020.01.094 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087816143&doi=10.1016%2fj.matpr.2020.01.094&partnerID=40&md5=33e5415c4aef99c98216d2a255606fe1
Mathivanan N.R., Department of Mechanical Engineering, Pes University, Bangalore, 560085, India; Aiyappa A.C., Department of Mechanical Engineering, Pes University, Bangalore, 560085, India; Kumar M.H., Department of Mechanical and Automobile Engineering, Christ University, Bangalore, 560074, India
Experimental Investigations on Erosion-Corrosion Characteristics of HVOF-Sprayed WC-10% Ni Coatings Deposited on Aluminum Alloy
The current work investigates the erosion-corrosion behaviour of thermally sprayed tungsten carbide-10% nickel (WC-10% Ni) coatings placed on the AA6061 aluminum alloy. The AA6061 aluminum alloy was coated with tungsten carbide -10% nickel coatings utilising a high-velocityoxy-fuel (HVOF) spray method. The microstructure and hardness of thermally sprayed coatings were examined using a scanning electron microscope (SEM) and a Vickers hardness tester. The slurry erosion-corrosion wear tests were carried out by varying the parameters of the slurry erosion process, such as testing time, slurry content, slurry speed, and impinging particle size, on the erosion testing equipment. The data demonstrated that when slurry concentration, slurry speed, and impinging particle size increased, so did the slurry erosion-corrosion wear loss. The wear processes of uncoated and thermally sprayed tungsten carbide -10% nickel have been examined using SEM and a 3-D confocal microscope. Copyright 2023 G. S. Pradeep Kumar et al.
Kumar G.S.P.; Sunkad S.; Jogeshwar R.; Keshavamurthy R.; Tambrallimath V.; Jangam S.; Basheer D.
Advances in Materials Science and Engineering, Vol-2023
https://doi.org/10.1155/2023/8533871 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85149127149&doi=10.1155%2f2023%2f8533871&partnerID=40&md5=e051aa6b56c875b3f23e6736bba467c1
Kumar G.S.P., Department of Mechanical and Automobile Engineering Christ University, Karnataka, Bangalore, 560074, India; Sunkad S., Automobile Engineering Christ University, Karnataka, Bangalore, 560074, India; Jogeshwar R., Automobile Engineering Christ University, Karnataka, Bangalore, 560074, India; Keshavamurthy R., Department of Mechanical Engineering Dayananda Sagara College of Engineering, Karnataka, Bangalore, 560078, India; Tambrallimath V., Department of Aeronautical and Automobile Engineering Manipal Institute of Technology Manipal Academy of Higher Education, Karnataka, Manipal, 576104, India; Jangam S., Department of Mechanical and Automobile Engineering Christ University, Karnataka, Bangalore, 560074, India; Basheer D., Department of Mechanical Engineering Haramaya Institute of Technology Haramaya Univeristy, Dire Dawa, 138, Ethiopia
Experimental Investigations on Static, Dynamic, and Morphological Characteristics of Bamboo Fiber-Reinforced Polyester Composites
The use of natural fiber-reinforced polymer composites has increased over a period of time, majorly due to the ecosustainability and biodegradability of the composites. Among several grades of natural fibers, bamboo fibers offer numerous environmental and cost benefits and possess excellent mechanical characteristics. The superior properties of the bamboo fibers have triggered the research interests in the domain of bamboo fiber-reinforced polymer composites. Among the polymers, polyesters are long chain molecules made up of atoms arranged in various ways with other elements to form the basic building blocks of a polymeric chain. Polyester is being increasingly employed in today's industrial products due to its inherent advantages. As a result, based on the potential properties of bamboo fibers as reinforcing materials and polyester resin as matrix material, the biocomposites are synthesized by hand lay-up technique and the specimens cut as per the standard dimensions and subjected to mechanical investigations, vibration, and morphological characterization as per the ASTM test methods. The increase in fiber weight content has enhanced flexural, tensile, and impact characteristics and improved the damping characteristics of the composite specimens. The microstructural evaluations have revealed the uniform distribution of the bamboo fibers in the resin, and the morphological studies of the fractured specimens have revealed that the fracture is majorly due to the matrix cracks rather than the fiber debonding, which is a major attribute ascertaining the strong coherent strengthening mechanism brought about by the inclusion of bamboo fiber in the polyester resin. 2022 N. Santhosh et al.
Santhosh N.; Praveena B.A.; Srikanth H.V.; Angadi S.; Gunge A.; Rudra Naik M.; Shankar G.; Ramesha K.; Ravichandran G.
Santhosh N., Department of Mechanical Engineering, MVJ College of Engineering, Bengaluru, 560067, India; Praveena B.A., Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Yelahanka, Bengaluru, 560064, India; Srikanth H.V., Department of Aeronautical Engineering, Nitte Meenakshi Institute of Technology, Yelahanka, Bengaluru, 560064, India; Angadi S., Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Yelahanka, Bengaluru, 560064, India; Gunge A., Department of Mechanical Engineering, Nagarjuna College of Engineering & Technology, Bengaluru, 562164, India; Rudra Naik M., Department of Electro-Mechanical Engineering, Arba Minch University, Sawla Campus, Ethiopia; Shankar G., Department of Mechanical Engineering, MVJ College of Engineering, Bengaluru, 560067, India; Ramesha K., Department of Mechanical and Automobile Engineering, School of Engineering and Technology, CHRIST, Deemed to Be University, Kengeri Campus, Karnataka, Bangalore, India; Ravichandran G., Department of Mechanical and Automobile Engineering, School of Engineering and Technology, CHRIST, Deemed to Be University, Kengeri Campus, Karnataka, Bangalore, India
Experimental Investigations on the Thermal Diffusion Characteristics and Photoluminescence in Multiphase Micro Fluids Containing ZnO Micro Tubes and Fluorescein Dye
fluorescein; thermal diffusivity; thermal fluidics; thermal lens; ZnO micro tubes
Abstract: Scattering of light by disordered structures is normally detrimental to their applicability in many optoelectronic devices. However, some micro and nanostructures are useful in enhancing several optical and thermal properties like emission, heat diffusion etc. For this purpose, we have optimized the low temperature hydrothermal growth method for the ZnO micro tubes which leads to the growth of ZnO as mono dispersed micro tubes. Further, these samples were used to enhance the fluorescence efficiency of disordered media consisting of micro tubes of ZnO and fluorescein dye and to optimize the thermal diffusion of the mixture which will help us optimize the composition of these microscopic inclusions in designing a random lasing medium. Dual beam thermal lens method was used for this purpose. 2020, Pleiades Publishing, Ltd.
Optics and Spectroscopy, Vol-128, No. 12, pp. 2036-2045.
Frincy F., Department of Physics and Centre for Research, St. Teresas College (Autonomous), Ernakulam, 682011, India; Anila E.I., Departement of Physics and Electronics, CHRIST(Deemed to be University), Bengaluru, 560029, India; Santhi A.J., Department of Physics and Centre for Research, St. Teresas College (Autonomous), Ernakulam, 682011, India
Experimental Investigations on Turbine-Generator Shaft Under Subsynchronous Resonance
Damper; Finite element method; Modal analysis; Rotor dynamics; Subsynchronous resonance; Turbo-generator shaft
Energy exchange takes place between turbine and generator in the power system during subsynchronous resonance (SSR) which leads to torsional interaction between the shafts. Resonance in the power system is caused by the series capacitors connected to the transmission line. This paper aims to present an electromechanical approach to analyse and interpret subsynchronous resonance using the Finite element method. Subsynchronous resonance is introduced in two test rigs consisting of turbine, generator, shaft, and coupler with capacitors. Experiments and simulations (torque analysis and frequency response analysis) are conducted in test rigs and ANSYS workbench 16.0. Moreover, a spring damper is modelled to improve the stability of the shaft. From the results, it is clear that mechanical stress is increased when capacitors are connected to the test rig. A spring damper is installed at the point where the deformation is high. The damper reduced the stress and the vibration. 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Manikandan P.; Sushanth G.; Haneesh K.M.
Lecture Notes in Electrical Engineering, Vol-977, pp. 693-703.
Manikandan P., Department of EEE, CHRIST (Deemed to be University), Bengaluru, India; Sushanth G., Department of ECE, CHRIST (Deemed to be University), Bengaluru, India; Haneesh K.M., Department of EEE, CHRIST (Deemed to be University), Bengaluru, India
Experimental screening of a series of earth-abundant bi-metallic phospho-boride electrocatalysts for overall seawater electrolysis
Bimetallic phospho-borides; Hydrogen evolution reaction; Overall seawater-splitting; Oxygen evolution reaction; Seawater electrolysis; Transition metal
Seawater electrolysis offers a promising alternative for large-scale hydrogen production, but its industrial viability is hindered by the lack of efficient electrocatalysts. Herein, a series of metals (M = Ni, Fe, W, Mo, V, Cu, and Mn) were experimentally screened to form a bi-metallic catalyst with CoPB, resulting in CoMPB catalysts. Amongst the screened metals, only the inclusion of Mo, W, V, and Fe was found to be beneficial in improving the seawater-splitting reaction rates. Notably, CoMoPB, CoWPB, and CoVPB required minimal HER overpotentials of 56, 105, and 73 mV, respectively, at 10 mA/cm2 in alkaline natural seawater conditions, while CoFePB (291 mV at 10 mA/cm2) outperformed other Co-M-P-B counterparts for OER. The addition of a second metal to CoPB enhances activity, conductivity, and surface reactivity by modulating electron density, optimizing it for seawater splitting. Further, the CoWPB/NFHER || CoFePB/NFOER combination yielded the lowest cell potential of 1.59 V at 100 mA/cm2 and sustained operation for over ?65 h in alkaline natural seawater with ?98 % OER selectivity. The same combination, when integrated into an advanced seawater electrolyzer with zero-gap assembly, required a cell voltage of ?1.94 V to achieve 0.5 A/cm2, demonstrating strong commercial potential. 2025 Hydrogen Energy Publications LLC
Silviya, R.; Gupta, Suraj; Spreitzer, Matja; Patel, Nainesh; Fernandes, Rohan
International Journal of Hydrogen Energy;Volume;170;Issue;;Article No.;151245;
Restricted Access; Hardcopy may be available in the library
https://doi.org/10.1016/j.ijhydene.2025.151245 https://www.scopus.com/pages/publications/105014483021?origin=resultslist
Silviya R., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Gupta S., Advanced Materials Department, Joef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia; Spreitzer M., Advanced Materials Department, Joef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia; Patel N., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Fernandes R., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India
Experimental scrutinization on production of biogas from vegetable and animal waste
and waste; Biogas; CAD; CHD; energy source; pH; VW
Anaerobic fermentation is a highly promising technology for converting biomass waste into methane, which may directly be used as an energy source. The objective of this research was to investigate production rate of biogas from camel dung, chicken dropping and vegetable waste. Attempts have been made in this study to optimize various parameters in order to determine the most favorable conditions for maximum biogas production from three different types of wastes such as camel dung (CAD), chicken droppings (CHD) and vegetable waste (VW). The amount of biogas produced from the wastes is compared as: VW >CHD>CAD. The results showed that biogas produced from VW is 720 ml in 32 days as compared to CHD and CAD which are 600 ml in 36 days and 80 ml in 40 days respectively. The effect of the pH and temperature on the amount of biogas produced was also studied. The experiments were conducted in temperatures ranging from 36 C to 44 C. 2023 Author(s).
Saravanan A.M.; Al Mamari G.; Patil G.; Achuthan M.; Dhanalakshmi V.; Prakasha G.S.
https://doi.org/10.1063/5.0120661 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85152646951&doi=10.1063%2f5.0120661&partnerID=40&md5=43870d4287d2e51d1f5a3ed552c5c32d
Saravanan A.M., Department of Mechanical and Industrial Engineering, College of Engineering, National University of Science and Technology, Muscat, Oman; Al Mamari G., Department of Mechanical and Industrial Engineering, College of Engineering, National University of Science and Technology, Muscat, Oman; Patil G., Department of Mechanical and Industrial Engineering, College of Engineering, National University of Science and Technology, Muscat, Oman; Achuthan M., Department of Mechanical and Industrial Engineering, College of Engineering, National University of Science and Technology, Muscat, Oman; Dhanalakshmi V., Middle East College, Muscat, Oman; Prakasha G.S., Christ University, Karnataka, Bangalore, India
Experimental study of response parameters during machining of Inconel 718 with cryogenically treated ceramic round tool using cutting fluid
Cryogenically treated ceramic insert; Cutting fluid; Inconel 718; Response surface methodology
Highly advanced superalloys are being rapidly spreading throughout the globe. It's in need of the hour to produce similar materials which are being used in several industries similar as petrochemical, biomechanical, aerospace and marine industries. Inconel 718 is one similar superalloy which is being used due to its better characteristic features like high attrition resistance, high temperature burden conditions, thermal fatigue resistance, and cryogenic temperatures. Owing to the hardness conditions, tools indicate the low tool life and high wear characteristics. Ceramic insert is one such tool that is being used to machine Inconel 718 which is cryogenically treated to improve tool life. The use of emulsified cutting fluid reduces tool wear and improve durability of the tool, thereby improving the efficiency of the machining of Inconel 718. In this paper, experimental investigation has been carried to find the use of emulsified cutting fluid that improves the machinability of Inconel 718 based on parameters such as surface roughness and tool wear under the effect of cutting parameters which are cutting speed, feed rate and depth of cut. 2021 Elsevier Ltd. All rights reserved.
Materials Today: Proceedings, Vol-47, pp. 4281-4287.
https://doi.org/10.1016/j.matpr.2021.04.573 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117772859&doi=10.1016%2fj.matpr.2021.04.573&partnerID=40&md5=948298b060dd731ac5b3f2b7abc34dfa
Rout I.S., School of Engineering and Technology, CHRIST, Deemed to Be University, Bangalore, 560074, India; Pandian P.P., School of Engineering and Technology, CHRIST, Deemed to Be University, Bangalore, 560074, India; Raj A., School of Engineering and Technology, CHRIST, Deemed to Be University, Bangalore, 560074, India
Experimental study of solar dryer used for drying chilly and ginger
Open air solar drying is one of the most popular methods for drying food products holds many drawbacks resulting in contamination of food products. This project is to transform the traditional method to an innovative, clean and cost-effective method to dry chilly and ginger, two being the top export commodity of India. Here a solar dryer is made which comprised of flat plate air heater, a chamber for drying and an air blower which induces forced convection. This system enhances the drying process even at low-intensity sunlight by assimilating heat storage materials. The equipment was tested in the meteorologicalcondition of the faculty of engineering, Christ (Deemed to be University) (latitude of 12.86N, a longitude of 77.43E) Bangalore, Karnataka. The process has reduced the moisture content from around 72.69% to 28.24% in the case of chilly and from 68.88% to 14.31% in the case of ginger within a period of 10 hours for a mass flow rate of 0.051kg/s. Average drier efficiency was estimated to be about 22%. The specific moisture extraction rate was estimated to be about 0.76 kg/kWh. This process resulted in a better moisture extraction rate, eliminating the defects caused by open sun drying. This process resulted in a better moisture extraction rate, eliminating the defects caused by open sun drying. 2019 Author(s).
Rajashekaraiah T.; Bedi R.; Francis F.; Johny J.
https://doi.org/10.1063/1.5092910 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063249699&doi=10.1063%2f1.5092910&partnerID=40&md5=122c7b9c9d9dde618f4b19a7b52450dd
Rajashekaraiah T., Faculty of Engineering, Christ (Deemed to Be University), Bengaluru, Karnataka, 560074, India; Bedi R., Faculty of Engineering, Christ (Deemed to Be University), Bengaluru, Karnataka, 560074, India; Francis F., Faculty of Engineering, Christ (Deemed to Be University), Bengaluru, Karnataka, 560074, India; Johny J., Faculty of Engineering, Christ (Deemed to Be University), Bengaluru, Karnataka, 560074, India